Solvent for acetyl cellulose.



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To all whom c't may concern:

' Be it known that 1," WILLIAM G. LI'NDsAY, a citizen of the United States, residing in Caldwell, county of Essex, State of New Jersey, have invented certaln new and useful Improvements in Solvents for Acetyl Cellulose, of which the following is a specification.

The various compositions to which the present invention relates are employed in the arts, sometimes as imitations of natural substances, and sometimes as films which are used for photographic purposes, whether as the base upon which the sensitive coating is superimposed or as a component part of the film with which the sensitized substance has been partially incorporated in the sensitization. Although the final or useful form of the different compounds ofacetyl cellulose is that of a solid or dry material, the difierent processes of conversion into this final solid form involve, as is well understood, the em- "ployment of solutions and mixtures of varymg consistencies as to elasticity, stifiness or fluidity, depending generally upon the proportion or kind of solvent used to the amount of the original base-acetyl cellulose.

In the treatment of acetyl cellulose for the production of .solutions for the manufacitilllre of lacquers, varnishes, photographic ms, have discovered that while it is well lmown that epichlorhydrin is a solvent for acetyl cellulose and that the variety which is freely soluble in acetone dissolves freely in this liquid, there are certain objections to its use in the manufacture of acetyl cellulose plas: tic compounds due mainly to the rather high boiling point and the peculiar action of this solvent under manipulation.

I have found, however, that epi'chlorhydrin not only does not lose tion upon dilution with either ethyl or methyl alcohol but that such dilution or admixture results in a volatile product having lncreased solvent action and possessing certain characteristics of great value in the manufacture of acetyl cellulose plastic compounds.

One example of carrying out my invention is as follows I add to 100 parts of acetyl cellulose of the variety described from 20 to 50 parts of paraethyltoluolsulfonamid and from 10 to 30 parts of triphenylphosphate and make a Specification of fictters Patent.

and flexible or plastic compounds, I

in its solvent acuaw anasnr, n ssre non are run CELLUJLQID r, a conronnrion or NEW JnnsEY.

SOLVEN '1 FOR ACJETYL GELLULOSE.

Patented May 15, 1191?.

Application filed. May as, 1912. Serial n. 699,237.

made into a uniform mixture by means of a malaxator or other suitable mixing device and after thorough mixing the excess'of solvent is allowed to evaporate, preferably during further mixing, and the dough-like mass thus produced is then further worked up according to the well-known method of manufacturing nitro cellulose camphor compounds.

I have also found that the combination of epichlorhydrin and methyl alcohol is also useful in preparing lacquers, varnishes, and films from acetyl cellulose of the variety described. lln this case the quantity of volatile solvents in proportion to the acetyl cellulose is increased so as to make a more fluid mixture, and then upon spreading the solution upon a smooth surface such as glass and allowing the volatile solvent to evaporate there is left a resultant film which is useful.

for photographic purposes. In the case of a varnish or lacquer the solution would be spread upon the substance to which it is to be applied and the volatile solvent allowed to evaporate therefrom.

t was not possible to foretell from the chemical properties of epichlorhydrin what action these substances would have in admixture, but I have found them to be as stated above, and the operator will understand that l have described new solvents which will be of use to him in the particular case in which'they are adapted for his purpose.

Having thus described my invention, what claim is zv 1. A solvent for acetyl cellulose of that variety which is freely soluble in acetone which comprises epichlorhydrin and a monohydric alcohol having not more than two carbon atoms, said substances being present in about equal proportions, substantially as described.

2. The solvent for acetyl cellulose of that variety which is freely soluble in acetone which comprises epichlorhydrin and methyl alcohol in about equal proportions substantially as described.

The composition of matter which comprises acetyl cellulose of that variety which is freely soluble in acetone,-epichlorhydrin and a monohydric alcohol having not more than two carbon atoms, said substances being present in about equal proportions, said composition further comprising paraethyltoluolsulfonamid. 4

4. The composition of matter which comprises acetyl cellulose of that variety which is freely soluble in acetone, epichlorhydrin and a monohydric alcohol having not more than two carbon atoms, said substances being present in about equal proportions, said composition further comprising paraethyltoluolsulfonamid and triphenylphosphate.

'5. The composition of matter which comprises acetyl is freely soluble in acetone, epichlorhydrin and a monohydric alcohol having not more than two carbon atoms, and paraethyltoluolsulfonamid.

6. The composition of matter which comprises acetyl cellulose of that variety which is freely soluble in acetone, epichlorhydrin and a monohydric alcohol having not more than two carbon atoms, paraethyltoluolsulfonamid and triphenylphosphate.

WI LIAM'G. LINDSAY. Witnesses:

RUTH MEYEBSON, J. E. HINDON HYDE.

cellulose of that variety which 

